Rispondi a "k-cup rim opens up during brewing"I have had the same problem with cops across the market, including Kurig brand. It tends to follow cup batches. Letting the extra air out seems to fix the problem. I listened to "the regular advice" on the net to no avail, ended up buying a new machine that I didn't need. Now when I get a bad batch of cups I just make sure to prepuncture them.